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Univ Sci & Technol Beijing, Sch Econ & Management, Business Management, Room 1214,Jingguan Bldg,30 Xueyuan Rd, Beijing 100083, Peoples R China Univ Sci & Technol Beijing, Sch Econ & Management, Business Management, Room 1214,Jingguan Bldg,30 Xueyuan Rd, Beijing 100083, Peoples R China